Was going to spec them, but found mine for sale without them. I live near Chicago. Don't miss them at all. What gets cold on a cold day in the M3W? Your nose, your hands, your face...not your arse. If it's so cold that your bum is freezing, you're probably not out driving your M3W. I've had mine out in 25 degrees F and my skinny butt was fine.
Having said that, the ladies seem to like heated seats..
